You know there's a pretty easy way to factor out thermals/throttling from the equation if you want to get a straight comparison of performance of an Intel architecture and a mobile chip...use GB3 with the mobile workload and then use a desktop chip to test the Intel processor, since there will be no throttling, especially if you throw a nice cooler on there.
There is no excuse for SPEC not releasing the retired SPEC_CPU_2000 for free now as everybody else's attempt at a cross-architecture benchmark are pretty flawed. It's a lot better than GB2/GB3/Antutu and all the others. The lack of a solid free alternative is why the flawed geekbench is so popular.